Lateral Resistance Characteristics of Sleepers in Railway Ballasted Tracks from Laboratory Model Tests
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1 1st China Japan Mini Workshop Lateral Resistance Characteristics of Sleepers in Railway Ballasted Tracks from Laboratory Model Tests Kimitoshi Hayano (Yokohama National University)
2 Contents 1) Effects of sleeper shape on lateral resistance of sleepers in railway ballasted tracks 2) Lateral resistance of sleepers in railway ballasted track subjected to angular folding at structure boundaries
3 Effects of sleeper shape on lateral resistance of sleepers in railway ballasted tracks
4 Outline 1) Background, objective and methodology 2) Model test conditions Sleepers, ballast Single-sleeper pullout test Track panel pullout test 3) Model test results Lateral resistance obtained from single-sleeper pullout tests Lateral resistance obtained from track panel pullout tests using five sleepers Lateral resistance obtained from pullout tests using different number of sleepers 4) Summary
5 Background Ballasted track sleepers have the important function of providing sufficient lateral resistance to prevent lateral movement of the rails. If the lateral force induced by the thermal expansion of the steel rails overcomes the lateral resistance of the sleepers, rail buckling may occur. However, there is a high degree of uncertainty in the prediction of the lateral resistance of various shapes of sleepers.
6 Objective and Methodology Single-sleeper pullout tests and track panel pullout tests were conducted in the laboratory on 1/5-scale models to evaluate the lateral resistance of various shapes of concrete sleepers. Effects of sleeper shape, sleeper spacing and number of sleepers on the lateral resistance were investigated. Sleepers prepared for model tests Track panel pullout test (1/5-scale models)
7 Outline 1) Background, objective and methodology 2) Model test conditions Sleepers, ballast Single-sleeper pullout test Track panel pullout test 3) Model test results Lateral resistance obtained from single-sleeper pullout tests Lateral resistance obtained from track panel pullout tests using five sleepers Lateral resistance obtained from pullout tests using different number of sleepers 4) Summary
8 Sleepers Six types of sleepers were prepared for model tests (a) Rectangular parallelepiped sleeper (b) 3H sleeper 66
9 (c) 20-mm-winged sleeper with rectangular ends (d) 40-mm-winged sleeper with rectangular ends 146
10 (e) 20-mm-winged sleeper with trapezoidal ends (f) 40-mm-winged sleeper with trapezoidal ends 146
11 Ballast used for model tests Percentage passing, P (%) Ballast 1/5 Standard Range Standard Range Particle diameter, D (mm) Particle size distribution Track beds of model tests were constructed from ballast using tamping and vibration methods to achieve a dry density of 1.60 g/cm 3.
12 Single-sleeper pullout tests Sleeper Horizontal displacement transducer Horizontal loadings were conducted at a constant displacement rate of 0.4 mm/min. Load cell (a) Top view Vertical displacement transducer 51 (b) Side view 40 Sleeper (Unit: mm) Ballasted track for single-sleeper pullout tests
13 Track panel pullout tests Sleeper 116 Number of sleepers used were three, five and seven. Load cell Horizontal displacement transducer The sleepers were spaced at 116 mm. (a) Top view 51 Vertical displacement transducer (b) Side view 40 Sleeper (Unit: mm) Ballasted tracks for track panel pullout tests for five sleepers
14 Outline 1) Background, objective and methodology 2) Model test conditions Sleepers, ballast Single-sleeper pullout test Track panel pullout test 3) Model test results Lateral resistance obtained from single-sleeper pullout tests Lateral resistance obtained from track panel pullout tests using five sleepers Lateral resistance obtained from pullout tests using different number of sleepers 4) Summary
15 Lateral resistance obtained from single-sleeper pullout tests RTRI (2012) suggested the following relationship, R panel R single 2.0 mm (in full scale) R panel R single 0.4 mm (in 1/5-scale) Horizontal Load, R (kn) mm-winged(rectangle) 20-mm-winged(rectangle) Rectangular parallelepiped 40-mm-winged(trapezoid) 20-mm-winged(trapezoid) 3H Horizontal displacement, d h (mm) Horizontal loads and horizontal displacements relationships
16 Lateral Resistance, 0.4 mm. R single (kn) mm-winged (trapezoid) 40-mm-winged (rectangle) 20-mm-winged (trapezoid) 20-mm-winged (rectangle) 3H Rectangular parallelepiped Weight, W sleeper (kn) Relationship between lateral resistance and weight obtained from single-sleeper loading tests
17 Load contribution ratio, R bottom /R total, R side /R total, R end /R total (%) ends sides bottom 3H RP 20 (rec) 20 (tra) 40 (rec) 40 (tra) Sleeper type Rectangular parallelepiped sleeper Winged sleeper Contributions of bottom resistance, side resistance, and end resistance to total resistance R total = aw sleeper + bγ ballast S end + cγ ballast S side (RTRI, 2012) where a, b, and c are constant parameters. S side is the first moment on the side face of the sleepers with respect to the upper edge, and S end is the first moment on the end face of the sleepers with respect to the upper edge.
18 The prediction method proposed in RTRI 2012 is valid not only for conventional sleepers, but also for winged sleepers. Lateral resistance estimated by Eq. RTRI 3. (2012) mm-winged (rectangle) 40-mm-winged (trapezoid) Rectangular parallelepiped Relationship between lateral resistance obtained from model test with that estimated by RTRI (2012) 3H 20-mm-winged (trapezoid) 20-mm-winged (rectangle) Lateral resistance, R single 0.4 mm. obtained from single sleeper pull-out tests
19 Lateral resistance obtained from track panel pullout tests using five sleepers 0.8 Horizontal Load, R (kn) mm-winged (trapezoid) 3H Rectangular parallelepiped 20-mm-winged (rectangle) Horizontal displacement, d h (mm) Horizontal loads and horizontal displacements relationships
20 R panel R single 0.4 mm (in 1/5-scale) Horizontal Load per sleeper, R (kn) sleeper 5 sleepers Horizontal displacement, d h (mm) Horizontal Load per sleeper, R (kn) sleeper 5 sleepers Horizontal displacement, d h (mm) (a) 3H sleeper (b) Rectangular parallelepiped sleeper Relationship between lateral resistance per sleeper and horizontal displacement obtained from single-sleeper pullout tests and track panel pullout tests
21 R panel R single 0.4 mm (in 1/5-scale) Horizontal Load per sleeper, R (kn) sleeper 5 sleepers Horizontal displacement, d h (mm) Horizontal Load per sleeper, R (kn) sleeper 5 sleepers Horizontal displacement, d h (mm) (c) 20-mm-winged sleeper with trapezoidal ends (d) 20-mm-winged sleeper with rectangular ends Relationship between lateral resistance per sleeper and horizontal displacement obtained from single-sleeper pullout tests and track panel pullout tests
22 The idea that the lateral resistance measured at a horizontal displacement of 2.0 mm in full-scale (or 0.4 mm in 1/5-scale) single-sleeper pullout tests corresponds to that in track panel pullout tests is only valid for limited conditions. Lateral resistance, 0.4 mm. R single and R panel (kn) The lateral resistance obtained at a horizontal displacement of 0.4mm in single-sleeper pullout tests, R single 0.4 mm. The lateral resistance obtained at a horizontal displacement of 10mm in track panel pullout tests of five sleepers, R panel 3H RP 20 (rec) 20 (tra) Sleeper type Comparison of lateral resistances per sleeper obtained from track panel pullout tests and single-sleeper pullout tests
23 (a) 3H sleeper (b) 20-mm-winged sleeper with trapezoidal ends Displacement of ballast analyzed by PIV at 10 mm horizontal displacement of sleeper in single-sleeper pullout tests Group piled effect
24 Ratio of lateral resistance per sleeper from track panel tests using five sleepers to that from single-sleeper pullout tests Eq. 6. Result of SSLT Group piled effect 3H Rectangular parallelepiped 20-mm-winged (rectangle) 20-mm-winged (trapezoid) Sleeper width / Sleeper spacing, SW/SS Relationship between ratio of lateral resistance obtained from track panel pullout tests to that obtained from single-sleeper pullout tests and normalized sleeper width
25 Lateral resistance obtained from pullout tests using different number of sleepers Horizontal Load per sleeper, R (kn) Number of sleepers 1 sleeper 3 sleepers 5 sleepers 7 sleeperes Horizontal displacement, d h (mm) (a) 3H sleeper
26 Horizontal Load per sleeper, R (kn) Number of sleepers 1 sleeper 3 sleepers 5 sleepers 7 sleeperes Horizontal displacement, d h (mm) (b) 20-mm-winged sleeper with trapezoidal ends
27 A B B n-2 n B A Simple calculation method for estimating the lateral resistance of sleepers in pullout tests for a wide range of numbers of sleepers; R n = 2R A + (n -2) R B =2αR single + (n-2)βr single (n > 2) α = (1 + β)/2 is assumed.
28 Lateral resistance per sleeper, R (kn) H Rectangular parallelepiped 20-mm-winged (trapezoid) 20-mm-winged (rectangle) Experiment Analyses the tests, Eqs Number of sleepers Relationship between lateral resistance per sleeper and sleeper number in pullout tests
29 Outline 1) Background, objective and methodology 2) Model test conditions Sleepers, ballast Single-sleeper pullout test Track panel pullout test 3) Model test results Lateral resistance obtained from single-sleeper pullout tests Lateral resistance obtained from track panel pullout tests using five sleepers Lateral resistance obtained from pullout tests using different number of sleepers 4) Summary
30 Summary (1/2) The side frictional resistance, end resistance, and bottom resistance significantly affect the total lateral resistance of the sleepers. The prediction method proposed in RTRI 2012 is valid not only for conventional sleepers, but also for winged sleepers. However, the idea that the lateral resistance measured at a horizontal displacement of 2.0 mm in full-scale (or 0.4 mm in 1/5-scale) single-sleeper pullout tests corresponds to that in track panel pullout tests is only valid for limited conditions. This is because of the piled group effect in track panel pullout tests.
31 Summary (2/2) Because the degree of the piled group effect is controlled by the ratio of the sleeper width to the sleeper spacing, a significant reduction of lateral resistance may be observed in track panel pullout tests depending on the sleeper type. The lateral resistance per sleeper in track panel pullout tests reduces with increasing number of sleepers. This is due to the effects of boundary conditions and loading width. Based on the results of the model tests, a simple calculation method for estimating the lateral resistance of sleepers in pullout tests for a wide range of numbers of sleepers is proposed.
32 Contents 1) Effects of sleeper shape on lateral resistance of sleepers in railway ballasted tracks 2) Lateral resistance characteristics of sleepers in railway ballasted track subjected to angular folding at structure boundaries
33 Lateral resistance characteristics of sleepers in railway ballasted track subjected to angular folding at structure boundaries
34 Outline 1) Background and Objective Earthquake effects Differential displacement and angular folding at structure boundaries 2) Methodology Modelling of angular folding in the experiment Cyclic behavior of angular folding during earthquake 3) Single sleeper pull-out test Effect of open or close state on the lateral resistance Effect of number of cyclic angular folding on the lateral resistance Effect of angular folding angle on the lateral resistance 4) Track panel pull-out test 5) Summary
35 Background Increase of axial force with the increase of rail temperature Lateral resistance of ballasted tracks Damage observed after an earthquake (Momoya et al. 2013) Earthquake may affect. Lateral resistance characteristics subjected to earthquakes should be clarified so that appropriate countermeasures can be implemented.
36 Nakamura et al. (2014) conducted a series of shaking table tests on full-scale ballasted tracks. They found that lateral resistance was reduced during and after seismic motions. Shaking table tests on a full-scale ballasted track (Nakamura et al. 2014)
37 Railway tracks at structure boundaries have other problems. Angular folding Differential displacement Elevated railway bridges subjected to earthquakes (Takahashi et al., 2008) In addition to seismic vibration, local differential displacement or folding at structure boundaries may reduce the lateral resistance of ballasted tracks.
38 Objective To investigate lateral resistance characteristics of railway ballasted tracks subjected to angular folding at structure boundaries.
39 Outline 1) Background and Objective Earthquake effects Differential displacement and angular folding at structure boundaries 2) Methodology Modelling of angular folding in the experiment Cyclic behavior of angular folding during earthquake 3) Single sleeper pull-out test Effect of open or close state on the lateral resistance Effect of number of cyclic angular folding on the lateral resistance Effect of angular folding angle on the lateral resistance 4) Track panel pull-out test 5) Summary
40 Methodology To conduct sleeper pull-out tests on small scale (1/5 scale) models. Loading 載荷方向 direction 載荷ロッド Sleeper ( 単位 (mm) :mm) Track panel pull-out test on a 1/5 scale model
41 3H sleeper (1/5 scale) (Mainly used for Shinkansen) Pull-out direction Crushed stones (Andesite) 1/5 scale beds
42 θ Opening θ Pull-out direction Opening Ballasted tracks subjected to angular folding Sleeper Modeling of angular folding in the experiment
43 Opening Closing Angular folding is repeated during an earthquake. Opening or closing situation can be cyclically expected at boundaries. Fisrt opening (Pull-out test) 20th opening (Pull-out test) Pull-out direction Folding angle Cyclic loading Fisrt closing (Pull-out test) th closing (Pull-out test) Cyclic behavior of angular folding in model test and sleeper pullout tests under opening or closing situation
44 Outline 1) Background and Objective Earthquake effects Differential displacement and angular folding at structure boundaries 2) Methodology Modelling of angular folding in the experiment Cyclic behavior of angular folding during earthquake 3) Single sleeper pull-out test Effect of open or close state on the lateral resistance Effect of number of cyclic angular folding on the lateral resistance Effect of angular folding angle on the lateral resistance 4) Track panel pull-out test 5) Summary
45 Single sleeper pull-out test Fisrt opening (Pull-out test) 20th opening (Pull-out test) Folding angle Cyclic loading Fisrt closing (Pull-out test) th closing (Pull-out test) Pull-out direction Single sleeper pull-out test at 20th open state
46 Folding angle Fisrt opening (Pull-out test) Cyclic loading 20th opening (Pull-out test) Angular folding experience reduced the lateral resistance Fisrt closing (Pull-out test) th closing (Pull-out test) Without folding The lateral resistance was drastically reduced under the open situation. Pull-out force (kn) st closing 10th closing 1st opening 20th opening 20th closing Sleeper's horizontal displacement (mm) Single sleeper pull-out test results(folding angle: 19/1000)
47 , 9.5, 19 Lateral resistance might be reduced little beyond 1 st loading (folding) Folding angle:4.75/1000(closing situation) With increase of the folding angle, the lateral resistance was decreased. Lateral resistance, (kn) /1000(Closing situation) 19/1000(Opening situation) 19/1000(Closing situation) Number of cyclic loading Single sleeper pull-out test results
48 Fisrt opening (Pull-out test) 20th opening (Pull-out test) Folding angle Cyclic loading Fisrt closing (Pull-out test) th closing (Pull-out test) Before the start of 1st folding After the 20th cyclic angular folding Accumulated displacements after the 20 th angular folding from PIV
49 Slope 法面 Shear strain was significantly developed near the sleeper end before pull-out loading. The fact indicates that the bottom end resistance could be reduced before the start of pull-out tests. まくらぎ Sleeper ワイヤー Pull-out direction 載荷方向 Maximum shear strain distribution near the sleeper end after the 20 th angular folding from PIV
50 A 240 B 240 C Residual displacement in y direction, (mm) 100 y x Sleeper Ballasts moved away from the sleeper side. The fact indicates that the side resistance could be reduced Number of cyclic loading Residual displacements in y direction at points A, B and C near the sleeper side from PIV C A B
51 Outline 1) Background and Objective Earthquake effects Differential displacement and angular folding at structure boundaries 2) Methodology Modelling of angular folding in the experiment Cyclic behavior of angular folding during earthquake 3) Single sleeper pull-out test Effect of open or close state on the lateral resistance Effect of number of cyclic angular folding on the lateral resistance Effect of angular folding angle on the lateral resistance 4) Track panel pull-out test 5) Summary
52 Track panel pull-out test Pull-out direction Pull-out direction Track panel pull-out with 5 sleepers
53 Folding angle Fisrt opening (Pull-out test) Cyclic loading 20th opening (Pull-out test) Angular folding reduced the lateral resistance Fisrt closing (Pull-out test) th closing (Pull-out test) Pull-out force (kn) Without folding 20th opening 1st opening Sleepers' horizontal displacement (mm) Track panel pull-out test results(folding angle: 19/1000)
54 Pull-out force (kn) Without folding 1st opening 20th opening Sleeper's horizontal displacement (mm) Single sleeper pull-out test results Pull-out force (kn) (folding angle: 19/1000) Without folding 20th opening 1st opening Sleepers' horizontal displacement (mm) Track panel pull-out test results Reduction of lateral resistance was % in case of single sleeper pull-out tests while % in case of track panel pullout tests.
55 Load cells Sleeper A Sleeper B Sleeper C Load cells were installed on the sleepers so that lateral resistance of each sleeper could be measured in the track panel pull-out tests.
56 Boundary Pull-out direction A B C The more away from the structure boundary, reduction of the lateral resistance is less significant. Sleeper The lateral resistance of sleeper C just above the boundary is similar to that from the single pullout test after folding. Lateral resistance (kn) Sleeper B Sleeper A Sleeper C Single sleeper pull-out test Track panel pull-out test folding angle: 19/ Number of cyclic loading Change of lateral resistance of each sleeper
57 Ration of the lateral resistance in track panel pull-out tests after foldings Structure boundary Sleeper B Sleeper C Affected sleepers Sleeper A folding angle: 19/ Horizontal distance from the boundary (mm) Ratio of lateral resistance of each sleeper before folding to that after folding
58 The seismic vibration itself can reduce the lateral resistance further. Track panel pullout test Lateral resistance 100% About 40% Angular folding Boundary Horizontal displacement from the boundary Single sleeper pullout test About 70% (folding angle: 19/1000) Schematic image of the effect of angular folding on the lateral resistance in railway ballasted tracks
59 Outline 1) Background and Objective Earthquake effects Differential displacement and angular folding at structure boundaries 2) Methodology Modelling of angular folding in the experiment Cyclic behavior of angular folding during earthquake 3) Single sleeper pull-out test Effect of open or close state on the lateral resistance Effect of number of cyclic angular folding on the lateral resistance Effect of angular folding angle on the lateral resistance 4) Track panel pull-out test 5) Summary
60 Summary 1. Physical modeling methods which simulate angular folding of ballasted tracks at structure boundaries were attempted. 2. Folding experience reduced the lateral resistance of ballasted tracks. With the increase of folding angle, the lateral resistance reduced. 3. The lateral resistance was sharply decreased by the first angulra folding, but reduced little beyond the first loading when the folding angle remained constant. 4. The more away from the structure boundary, reduction of the lateral resistance of the sleeper became less significant. 5. Based on the experimental results, track area affected by the angular folding was suggested. Reduction rate of the lateral resistance by the angular folding was also proposed.
61 Thank you very much for your kind attention. Please contact for discussions.
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